SCP Foundation

1. Cigar that cures cancer when smoked
2. Snow globe of site 19 that causes changes in the weather around the real site 19
3. Exit ramp on a turnpike somewhere that leads to the same spot on a certain day in the 1940's
4. Sandwitch that compels one to eat it, but bites appear out of the one that consumes it
5. Squirrel that claims to be Winston Churchill
6. Creature that eats shadows, if it eats someone's shadow that person never casts a shadow again.
7. Mysterious abandoned room at the center of the earth filled with weird knobs, switches and controlls
8. Nuclear bomb that rebuilds things when detonated
9. Abandoned building that seems to have once been part of the SCP but no one remembers it

1. Would make a better joke SCP.
2. SO somebody or something who had knowledge of the foundation created this?
3. TIME TRAVEL WOOOOOPDY DOOOOO
4.*SANDWICH
5. Isn't Winston Churchill suppose to be a bull dog?
6. Could work, needs major revisions.
7. Really boring.
8. 1 and 8 just seem to be reverse things not very creative.
9. Clarify?

All of these ideas need to be more thought out than they are. Mull them over yourself for a while before you send them the way of the community; then you can stand by one and watch it develop from seed to sapling.

1 & 8 are invert property scips. These aren't interesting when the sole premise is an object that behaves differently or opposite the way it's supposed to.

2, 4, & 6 are magical objects. Their effect is unoriginal. Make them original if you're going to go that way, although I'd say muck these ideas.

3 could be done, but it would take a degree of finesse to pull off, and would probably be very frustrating to write up. I'd put that one on the backburner until you've developed your writer-intuition.

5 is an animal claiming to be a human, which has been done quite a bit. I would not recommend doing this, since it would mean exploring a human personality, which is hard enough as it is, and then exploring it in a way that makes it novel.

I don't really know what you mean by 'part of the SCP' in 9, but whether it's a forgotten SCP, or part of the SCP Foundation, neither would be advisable CoAs.

A scip shouldn't be an object and an effect, it should tell a story. Or at least suggest one.

The difference becomes more obvious the more you've been around the site. One of my first attempts at an article was a hand-dryer that operated with hyper-efficacy, and dehydrated organic tissue to near-immolation. It was very well-written (which is where you need to start, too; if you can't write well, the core premise doesn't really matter), but it was a horrible article. Just a blow-dryer that dried too well. So the containment procedures was pretty much 'stay away from it', the description was pretty cut-and-dry, and the backstory was pretty obvious.

Compare that to the same effect given a more interesting article. Take the dehydratory effect, and give it a new home. Say, a blow-up doll instead of a blow dryer. And every time it's activated, the doll recites one of the Mother's lines from Pink Floyd's The Wall Album. Yeah. Eye-opener. And a lot more interesting. So we have an object that pretty much destroys the hands of people in a few seconds, with no story or hint at a story, or real eerie place in the Foundationverse beyond being an anomalous pseudo-weapon, and a RealDoll sexually crippling young men and whispering 'Mama's gonna check out all your girlfriends for you, Mama won't let anyone dirty get through.' One of these will receive at least some upvotes.

So take these kernels of ideas and think them over, adding and plucking ideas and clauses from them until you find something interesting. Think abstractly, weirdly, until you find something you like. And then explore them rationally and expound.

Of course, don't use the Real Doll, because that's mine.

Edit: Not to suggest that what you write has to be scary or creepy to be on the site. Interesting above all else. Actually, just interesting. If it's interesting, do your thing however you will.

#1: Cigar that cures cancer — no. This is not a good idea. It's just a boring anomalous reversal: "something what does the reverse of what it normally does". (It would also be a very bad joke SCP idea, despite the odd suggestion given above.)
#2: OTT snowglobe is probably the worst idea here. It's not interesting and a very obvious idea.
#3: Meh. Could work with a good angle. Not inherently interesting — the vault you mention above is good imagery, but not enough to make this work.
#4: This is not an interesting idea, and derivative of dozens of already existing articles.
#5: This is not an interesting idea, and also derivative of already existing articles with no new angle.
#6: This could be good, but as written it's just a 'wandering monster'. The concept could be compelling, but… would have to see a draft. It could easily be a very boring straightforward writeup.
#7: The way you write this, it sounds like that is literally all you have in mind for this. A mysterious room at the center of the Earth is a good idea, but you can't just have a mysterious room with mysterious dials and expect that to be entertaining enough on its own.
#8: This is the same bad concept as #1, but a "reverse nuclear bomb" is kinda compelling imagery. Depends how you write it.
#9: This is a really derivative idea. It would be cool for a basis for a tale or tales, but as an SCP, it's not very promising.